Quote:
Originally Posted by JFP in PA
This fault means “Supply voltage at terminal 50” this was often caused by a disconnected battery or an internal failure in the PAS control module. Porsche Access System PAS Module: P/N 997.618.172.12
If the PAS module is bad, a new one is around $430 at retail, and requires the use of a PIWIS to recode to the car.
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I've reset that code and it's not returned so I'm guessing it was as you've stated a simple disconnect.